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-rw-r--r--src/powerlist.cc4
1 files changed, 4 insertions, 0 deletions
diff --git a/src/powerlist.cc b/src/powerlist.cc
index 6fc77ad..6cff863 100644
--- a/src/powerlist.cc
+++ b/src/powerlist.cc
@@ -27,7 +27,11 @@
#include "powerlist.h"
#include <stdlib.h>
+
+// Otherwise M_PI is not defined in math.h on some older platforms...
+#define _USE_MATH_DEFINES
#include <math.h>
+
#include <string.h>
#include <hugin.hpp>